In ICSE Class 10 Biology textbook disease, any harmful deviation from an organism's normal structural or functional state usually associated with certain signs and symptoms, and of a nature different from physical injury. A diseased organism usually shows signs or symptoms that indicate its abnormal state. Thus, to recognize the disease's hallmarks, the normal condition of an organism must be understood. Nevertheless, there is not always a sharp demarcation between disease and health. Notes of ICSE Biology Class 10 are on the Extramarks website.

In ICSE Class 10 Biology The disease study is referred to as pathology. It involves determining the cause (aetiology) of the disease, understanding its developmental mechanisms (pathogenesis), the structural changes associated with the process of the disease (morphological changes), and the functional consequences of such changes. To identify the correct course of treatment, it is necessary to correctly identify the cause of a disease. Notes of ICSE Biology Class 10 can be found on Extramarks.

Human beings, other animals and plants are all susceptible to some kind of disease. However, there may be no effect on the other types that disrupts the normal functioning of one type of organism.

In ICSE Class 10 Biology terms of chemical, physical, and functional processes, the normal state of an organism represent a condition of delicate physiological balance, or homeostasis, maintained by a complex of mechanisms that are not fully understood. Therefore, in a fundamental sense, the disease is the consequences of a breakdown of the mechanisms of homeostatic control. Get all the ICSE Class 10 Biology on Extramarks app.
In some cases, the mechanisms affected are indicated, but in most cases, a complex of mechanisms is disturbed, initially or sequentially, and it is elusive to define the pathogenesis of the ensuing disease. For instance, death in humans and other mammals is often a direct result of heart or lung failure, but the prior event series is highly complex, leading to abnormalities in other organ systems and control systems. ICSE Class 10 Biology Notes of the best quality is on Extramarks.
In the individual organism itself, the original cause of the disease may lie, and the disease is then said to be idiopathic, innate, primal or "essential." It may result from an inevitable side effect or because the therapy itself was not well-advised; the disease, in either case, is classified as Iatrogenic.
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